Online activists Anonymous are targeting the European Parliament and supporters of the Anti-Counterfeiting Trade Agreement (ACTA), which critics say would curtail freedom of expression and encourage surveillance by service providers.

Copyrightalliance.org was inaccessible today after Anonymous set its sights on the Web site for its pro-ACTA stance. Meanwhile, hackers were poking at the sites of the European Parliament and governments in the EU, with plans to dig up information on officials that could be released publicly, a source familiar with Anonymous' plans told CNET.

Critics say ACTA is even worse than SOPA in that it allows for closed door negotiations and can't be repealed. The European Parliament is due to vote on ACTA in June.

After 22 European Union member states signed ACTA yesterday, the European Parliament's independent monitor for ACTA, Kader Arif of France, resigned today, saying he was opposed to the lack of transparency on the ACTA negotiations, the fact that the public was not consulted, and other unusual "maneuvers," according to the BBC.